塔里木盆地志留系古油藏规模探讨

PROBE OF THE SCALE OF PALAEO RESERVOIR IN SILURIAN,TARIM BASIN

塔里木盆地志留系有广泛的沥青砂岩分布,表明志留系曾经有大规模的油气聚集,同时也说明志留系古油藏曾经遭受了严重的破坏。弄清志留系古油藏规模的大小,对正确评价志留系的剩余资源量及对志留系的进一步油气勘探都具有重要的意义。研究了志留系沥青砂岩分布特征、形成阶段及形成机理,建立了早期志留系油气成藏模式,分析了志留系古油藏的形成过程,认为现今志留系广泛分布的沥青砂是古油藏形成后遭受构造破坏的过程中以及油藏破坏后油气运移补充的过程中形成的;志留系古油藏并不是一个整一的特大型古油藏,而是仅分布于古构造局部相对高部位的多个大型古油藏。

There are extensive bituminous sandstones in Silurian in Tarim Basin,which means substantive hydrocarbon was accumulated in Silurian in geological time and which also illustrates the palaeo reservoir accumulated early in Silurian was badly destroyed.To correctly evaluate remaining resources of Silurian and carry out further exploration in Silurian,it is very important for us to fully understand the scale of palaeo reservoir in Silurian.The distribution characteristics,forming process and mechanism of Silurian bituminous sandstones and the forming pattern of early Silurian reservoir are established,and the study results show that palaeo reservoir in Silurian are not so large on scale as imagined and not giant self-contained reservoir,there are only some big pools distributing in partial uplifts of pre-carboniferous.